Give two examples of each of modes of transport used on land, water, and air.

Fill in the blanks:

(i) One metre is ______________ cm.

(ii) Five kilometres is ______________ m.

(iii) Motion of a child on a swing is ______________.

(iv) Motion of the needle of a sewing machine is ______________.

(v) Motion of wheel of a bicycle is______________.

Why can a pace or a footstep not be used as a standard unit of length?

Arrange the following lengths in their increasing magnitude:-

1 metre, 1 centimetre, 1 kilometre, 1 millimetre.

The height of a person is 1.65 m. Express it into cm and mm.

The distance between Radha's home and her school is 3250 m.

Express this distance into km.

While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

Why could you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Give two examples of periodic motion.